Cobalt Jobbers contain a percentage of Cobalt in their steel, greatly increasing their wear resistance. shank size is the same as the diameter of the drill
Cobalt Jobbers - Letter Sizes
Cobalt Jobbers contain a percentage of Cobalt in their steel, greatly increasing their wear resistance. shank size is the same as the diameter of the drill
Cobalt Jobbers - Number / Wire Sizes
Cobalt Jobbers contain a percentage of Cobalt in their steel, greatly increasing their wear resistance. shank size is the same as the diameter of the drill
